The outside diameter of the bar is 23.8, the inside diameter is going to be a few mm smaller, which is perfect for those brake levers.

EDIT:
I just measured the inside inside diameter of one of my bars.
23.8mm outside and it measures 20mm inside. With tape, you might have trouble.
Do you have the bars with you? If so, measure the inside.

they work fine and i like the fact that the cable runs threw the inside of the bullhorns... my bullhorns had holes to run the cables so meh... it's somewhat tricky to tighten in the bar ends... you have to take out the cable and everything, and tighten them... then magically run the cable... LOL...

they work fine and i like the fact that the cable runs threw the inside of the bullhorns... my bullhorns had holes to run the cables so meh... it's somewhat tricky to tighten in the bar ends... you have to take out the cable and everything, and tighten them... then magically run the cable... LOL...